EASY
Earn 100
The hormone that regulates metamorphosis in insects is thyroxine.
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Important Questions on Reaching the age of Adolescence
EASY
In the absence of _____ in water, tadpoles cannot change into frogs.
MEDIUM
It was observed that the tadpoles are not growing into adult frogs in a village pond. A scientist who was asked to find the reason for this concluded that the pond water did not contain sufficient amount of a mineral P which could make a hormone Q. The hormone Q can cause a phenomenon R in tadpoles so that they become adult frogs.
What are (i) P (ii) Q, and (iii) R ?
EASY
_____ is essential for the formation of thyroxine.
EASY
Fill in the blank with the correct options from the box:
_____ control metamorphosis in insects.
| Puberty | Junk food | Insect hormones | Sweat glands, sebaceous glands | Drugs |
| Breasts | Pregnant | Father | Deep, high-pitched |
MEDIUM
Mention two conditions under which a frog larva will not develop into an adult.
MEDIUM
Metamorphosis in amphibians is brought about by _____ hormone.
EASY
Metamorphosis in amphibians such as frog is brought about by _____ hormone. (aldosterone/ throxine)
EASY
Degenerative changes occur during
MEDIUM
What is metamorphosis? Draw a diagram of the life cycle of a frog.
HARD
Name the hormone which brings about metamorphosis in silk moth and changes caterpillar (larva) into adult silk moth. (Insect hormone/oxytocin)
EASY
For the metamorphosis of tadpoles, which of the following elements must be available in water?
EASY
What do you think would happen if the thyroid gland of a tadpole is removed? (Hint: What is the role of hormones in metamorphosis?)
HARD
Name the hormone which is required for the metamorphosis of larvae (tadpoles) into adult frogs. (Ecdysone/Juvenile/Thyroxine)
MEDIUM
Tadpoles cannot mature into adults if the water in which they are growing lacks iodine.
MEDIUM
Write two examples for the following.
Hormones that control metamorphosis
EASY
Which of the following animals do not show metamorphosis?
EASY
Is the transformation from egg to adults in silkworm controlled by hormones?
HARD
What will happen if the water in which tadpoles are growing does not contain sufficient iodine ?
EASY
Metamorphosis in insects (like silk moth) is brought about by thyroxine hormone.
MEDIUM
Name the hormone which would be released during the development of a caterpillar to moth.
